CY7C421-20VC Cypress Semiconductor Corp, CY7C421-20VC Datasheet - Page 7
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CY7C421-20VC
Manufacturer Part Number
CY7C421-20VC
Description
Manufacturer
Cypress Semiconductor Corp
Datasheet
1.CY7C421-20VC.pdf
(16 pages)
Specifications of CY7C421-20VC
Configuration
Dual
Density
4.5Kb
Access Time (max)
20ns
Word Size
9b
Organization
512x9
Sync/async
Asynchronous
Expandable
Yes
Bus Direction
Uni-Directional
Package Type
SOJ
Clock Freq (max)
Not RequiredMHz
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (max)
5.5V
Supply Current
55mA
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
28
Lead Free Status / RoHS Status
Not Compliant
Switching Waveforms
Document #: 38-06001 Rev. *D
Notes
10. W and R ≥ V
11. t
MRSC
= t
R, W
PMR
Q
D
0
0
[10]
IH
–Q
–D
MR
HF
HF
EF
FF
+ t
W
R
W
around the rising edge of MR
R
RMR
8
8
.
HALF FULL
t
LZR
t
PW
t
A
Figure 4. Asynchronous Read and Write
t
t
WHF
RC
t
t
t
SD
t
HFH
FFH
EFL
DATA VALID
t
WC
DATA VALID
Figure 5. Master Reset
Figure 6. Half-full Flag
t
t
PMR
MRSC
t
RR
t
DVR
t
HD
[11]
t
WR
t
A
t
PR
HALF FULL+1
t
t
WPW
RPW
DATA VALID
t
RMR
DATA VALID
t
HZR
CY7C419/21/25/29/33
t
RHF
HALF FULL
Page 7 of 16
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